Spider molting sequences

(ENG) Spiders, as the rest of arthropods need to remove their old exoskeleton in order to grow, repair external damage, remove ectoparasites, and toxins accumulated on it.
Have you ever wondered how it is possible, that an external exoskeleton can contain an animal which is bigger as itself? After molting the animal stays hanging upside down, swelling up plenty of air as a balloon, before its new exoskeleton hardens up.